[SOLVED] How can I manage multiple threads in Ruby on Rails (equivalent of a Java thread factory)?

How can I manage multiple threads in Ruby on Rails (equivalent of a Java thread factory)?

I'm using Ruby on Rails 5 although I'm fairly a novice to Ruby/Rails. I have read about creating threads using

   t = Thread.new {
      sleep(rand(0)/10.0)
      Thread.current["mycount"] = count
      count += 1
   }

However, I'm wondering if there is a standard way of managing a bunch of application-created threads in Ruby/Rails. I'm familiar with Java, which has a thread factory. That allows a certain number of threads to concurrently run while others must wait in a queue. I'm wondering how I would do something similar in Ruby/Rails.

Note that I'm not talking about the types of threads that are generated automatically when a web page is requested. I'm talking about threads that I (the application owner) creates.

Solution

I think https://github.com/ruby-concurrency/concurrent-ruby is the most used library with utils for concurrency in ruby.

It has a lot of useful things including Thread Pools (http://ruby-concurrency.github.io/concurrent-ruby/file.thread_pools.html) which I think is what you are looking for.

Keep in mind that MRI Ruby has GIL, so you only have parallelism if your threads are waiting for IO. For heavy computation you might want to use jRuby or look elsewhere :)